Thank you for your answer.May a ask one question more?
I am from Estonia and we have ID cards (www.id.ee) for authorization. Also ID card is used for issuing digital signatures. If we want to use your components from PKIBlackbox package for working with smart cards (Estonian ID card is actually the card with a chip) would it be possible to add digital signatures to electronical documents?
If your components from PKIBlackbox package can work with our ID card and we are able to sign documents with them, which is the price of this package for delphi 7?
Best regards.

...would it be possible to add digital signatures to electronical documents?

Yes, if the card does support PKCS#11-compliant access (most of existing cards actually do).

BTW, what exactly electronic documents do you plan to sign? Different document formats introduce different security standards. SecureBlackbox supports signing according to PKCS#1 and PKCS#7 standards, which are utilized by PDF and XML document security.

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...which is the price of this package for delphi 7?

Please use the calculator to calculate the price of the license you are interested in. Choose VCL edition if you are interested in using SecureBlackbox with Delphi.

Could you explain me if Eldos have components which can communicate with these smart cards (We need to read object data from it)? If you have could you please give some tutorial or demo to make the solution of our problem easier?